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Forums >> Revit Building >> Technical Support >> importing Topography
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Joined: Mon, Jun 7, 2004
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I have followed the tutorials on importing topo from CAD and have created a surface. The problem is that after it is created the, Revit surface isn't exactly the same as the cad file. It is off by as much as 10' between contours. Any help?
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Joined: Mon, Mar 28, 2005
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very strange. lots of possibilities though.
when you created the toposurface, did you use the imported points method? if so, then maybe the cad file was not 'correct' by this 10'?
did you trace the contours using the in place point way? this should emulate it fine, so that may be no good.
if the contours nearly match in shape but are off by that 10', then the cad file has incorrect z coordinates. just move them, if so.
if the contours do not match in shape or z, then the cad file points are off. in this case create toposurface using points on the contour lines.
eldados or mr spot here in brisbane may have better answers.
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I have attached an image which shows my Revit surface and the cad contours. You will notice that they aren't parallel. My process was to use a 3D Cad surface and import using the -Import Instance- command. I thought it was something to do with the units but that was not the case. Thanks in advance for any trouble shooting efforts.
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I have also just tried to insert the points directly over the contour lines and have ended up with an almost identical outcome. If you edit the toposurface the points appear in the right place but when you finish sketch the contours are off. What am I doing wrong?
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Joined: Mon, Mar 28, 2005
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hi again
i am a bit lost as to why this is occuring. when our office does it, usually they are very close. anyone else have an idea?
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Joined: Thu, May 6, 2004
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we tried to do same from a cad file but it gave some very odd topography, then we realised that the survey company had lots of "shrapnel" on their drawing, points that were difficult to see in cad and were on various level layers so revit was reading all these additional points as levels. We had to resort to using the cad drawing as an underlay and manually input each level point.
We have only had to do this when using other companies survey drawings, it has worked a few times perfectly well on surveys we have produced ourselves in autocad and then imported.
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